Ventilated lamp house



Jam 13 11942 B. STECHBAR' 2,269,794

VENTILATED LAMP HOUSE Jan. 13, 1942. B STECHBART 2,269,794'

vENTILATED LAMP HOUSE Filed July 17, 1939 2 sheets-sheet 2 P'nenad Jan. 13, 1942 UNITED STATES PATENT OFFICE 2,269,794 l vENTnlA'rEn LAMP noUsE Bruno Stechbart, Chicago, Ill., assignor to The Bell Howell Company, Chicago, Ill., a corporation of Illinois Application July 17, 1939, Serial No. 284,890

'(Cl. 24o-47) 4 Claims.

My invention relates particularly to a ventilated lamp house for picture projecting machines and has for its m'aln object the provision of a novel and effective ventilating system for lamp houses, which, while maintaining a lamp at a safe operating temperature, eilects a relatively high temperature in the region of the iilament of the lamp with a, view toward maintained emciencyl and longevity of the lamp.

With this object in view my invention consists in certain features of novelty in the construction, combination, and arrangement of parts by which the said object and certain other objects, hereinafter appearingvareeilected al1 as fully described with reference to the accompanying drawings, and more particularly pointed out in the appended claims.

In the said drawings- Figure 1 is a vertical sectional view of a picture projecting machine having ventilated lamp incorporated with the main frame and is formedv f of an enclosure part 5 formed integrally Awith the main frame, the frame part 2 and a removable part or cover 6 forming the closed upper endof the enclosure, as designated at 1, and a portion of the side thereof, as designated at 8. The part 6 is removably secured on the enclosure part 5 by studs 9 secured on the part 6 and engaging in apertures II in the part 5 and a spring latch I2 engaging a. stud I3 on the part v5, the latch I2 being releasable from the stud I3.for removal of -thepart 6 by means of a push plunger I4 accessible from the exterior of the enclosure, as shown in Figure 1.

A vertically disposed elongated inner enclosure I5 isformed'integrally with the main frame and is disposed within the outer enclosure 4 in central relation therewith, and these enclosures provide vent space I6 therebetween surrounding the inner enclosure.

Mounted at the top of the inner enclosure I5 and arrangedwithin the outer enclosure 4, is a lamp mounting generally designated at I1, which is adapted for removably carrying an incandescent electric lamp I8 extending downwardly in the inner enclosure in central relation therewith, thus providing vent space 2| surrounding the lamp. The lamp is provided with a concentrated lament I9 disposed downwardly therein.

The lamp mounting I1 is fully described 'in my copending U. S. Application, Serial No. 290,264, tiled August 15, 1939, for Lamp mounting, and involves a body 22 secured on the top of the inner enclosure I6 and a movable part 23 hinged on the body 22, as designated at 24, for removal and insertion of the lamp I8 from above, and releasably secured in lamp retaining position by a spring latch 26. See Figure 1.

The intermediate portion of the inner enclosure I5 is provided with diametrlcally opposite .forward and rearward openings 26 and 21 alined with the lamp iilame'nt I9. See Figure 2. A

forwardly facing reflector 28 is adjustably screwthreaded into the rearward opening 21 for refleeting light from the lamp lament forwardly. A laterally extending slide mounting 29 is disposed at the forward opening 26, and-a condenser lens 3| is removably mounted in the slide mounting 23 for concentrating light from the lamp lilament, the frame part 2 being lprovided with a light opening 32 for the passage of the light fromthe lamp.

Removal of the part 6, forming the closed up- 'per end of the outer enclosure I and a portion of the side thereof, provides convenient access to the lamp mounting for removal and insertion of a lamp and to the rei-lector 28 and condenser lens 3l for the usual purposes.

The lower end of the outer enclosure l is pro' videdwith an intake vent opening into the vent space I6 and extended horizontally thereabout in the form of horizontally spaced openings 33.

The upper end of the inner enclosure I5 is prol vided with an intake vent opening from the vent space I6 and extended horizontally thereabout in the form of openings 34 spaced about the inner enclosure. The lower end of the inner enclosure I5 is open to form an outlet vent 35 extended horizontally thereabout.

A hollow formation 36 is formed integrally with the main frame I at the side o f the outer enclosure 4, and spaced laterally extending vertical partitions 31 within the formation 36 form a blower chamber 36 provided with a' lateral outlet vent 39. See Figures 1 and 2.

A motor 4I is mounted rearwardly in the formation 36 and the shaft 42 of the motor extends forwardly through the blower chamber 36 in cen- Y l 2,209,794 trai'brelation therewith. The partitions 31 are provided with intake openings 43 in central relation with the motor shaft, and a fan 44 of the centrifugal type in the blower 'chamber 33 is secured on the motor shaft 42 and is driven by the motor to draw air through the intake openings 43 and expel it through the outlet vent 39.

The outlet vent 35 of the inner enclosure I5 therewith and separate from said movable part and said enclosures providing vent space theremerges with a vent passage 45, formed in the main frame I, which extends horizontally from the vent 35 and then upwardly both forwardly and. rearwardly of the blower chamber 33, as designated at 4B, and communicating with both between, a lamp mounting on said inner enof the intake openings 43 of the blower chamber.

closure and within said outer enclosure in the Assuming the fan 44 to be driven, air is drawn through the intake openings 33, upwardly in the vent space I6 between the outer and inner lamp region of `said closed end for access thereto by means of said movable part and adapted for removably carrying a lamp extending within and longitudinally of said inner enclosure, said outel' enclosure being provided with an intake vent house enclosures, through the intake openings into said vent space in the region of the end thereof opposite said closed end, said inner enclosure being provided with an intake vent from said vent space in the region of said lamp mount- 34, downwardly in the vent space 2i about the lamp I8 in the inner enclosure, outwardly from 20 the outlet vent 35, through the vent passage 45, and through the blower intakes 43 into the blower chamber 38 from which the air is expelled from the outlet vent 39 by the fan, as indicated by the arrows in Figures 1 and 2.

ing and with an outlet vent in the region of thc end thereof remote from the closed end of the outer enclosure, and means for effecting air circulation outwardly from said outlet vent.

2. In a device of the character described, the combination with an elongated vertically disposed enclosure closed at its upper end and in- As so circulated, the air first absorbs heat in the vent space I6 between the outer and inner lamp house enclosures, after which it enters the inner vent space 2| of the lamp enclosure in the region of the base of the lamp and the lamp cluding a part movable to open said end, of a similarly disposed elongated mounting l1 remote from the filament I9 of the lamp, and, absorbing further heat in the inner enclosure therein in central relation therewith and separate from said movable part and said enclosures providing vent space therebetween surrounding said inner enclosure, a lamp mounting on the upper end of said inner enclosure and within said outer enclosure and accessible by means of said movable part and adapted for removably carrying a lamp extending downwardly in said inner enclosure in central relation therewith, said outer enclosure being provided with an inupper portion of the inner enclosure, passes the take vent into said vent space in the region of lament I9 at a relatively high temperature and out through the outlet vent at the lower end of the inner lamp house enclosure I5. Accordingly, the portion of the lamp in the region of the filament, while maintained at a safe operating temperature, is subject to the circulated air only after it has been heated by absorbing 40 heat in the vent space I6 and in the upper portion of the inner enclosure I5 with the result that the illament portion of the lamp is maintained at a relatively high degree of temperathe lower end thereof and extended horizontally thereabout, said inner enclosure being provided with an intake vent from said vent space in the ture with resulting maintained eiiiciency and longevity of the lamp, it being particularly noted the circulated air.

that the base portion of the lamp and the lamp result that they are maintained at a relatively region of the upper end thereof and extended horizontally thereabout and provided with an mounting are subjected to the circulated air before it attains its maximum heat with the low temperature.

outlet vent in the region of the lowerend thereof and extended horizontally thereabout, blower chamber at one side oi' said enclosures and provided with an outlet vent, a vent passage communicating said first mentioned outlet vent The reflector 28 and the conand said blower chamber, and a fan in said denser lens 3i are also subjected to cooling by The outer and inner lamp house enclosures and blower chamber for effecting circulation outwardly through said outlet vents.

the lamp being arranged in central relation with each other and the intake vents of the outer and inner enclosures and the outlet vent of the inner enclosure being extended horizontally 3. In a device of the character described, the

thereabout, the air circulation is generally unicombination with an elongated outer enclosure form about the inner enclosure and the lamp closed at one end and including a part movable with obvious advantages, and a deilector 41, see

to open said end and a portion of the side thereof, of a similarly disposed elongated inner enclosure therein in central relation therewith and separate from said movable part and said enclosures providing vent space therebetween, a

lamp mounting on said inner enclosure and further promote uniformity of circulation.

within said outer enclosure in the region of said closed end for access thereto by means of said Figure l, is associated with the outlet vent 35 to While I have thus described my invention, I do not wish to be limited to the precise details described as changes may be, readily made without departing from the spirit of my invention,

the following:

movable part and adapted for removably carrybut having thus described my invention I claim as new and desire to secure by Letters Patent ing a lamp extending within and longitudinally of said inner enclosure. optical means mounted within said outer enclosure in cooperative relation with the lament of said lamp and acl. In a device of the character described, the combination with an elongated outer enclosure closed at one end and including a part movable to open said end, of a similarly disposed eloncessble by means of said movable part, said outer gated inner enclosure therein in central relation enclosure being provided with an intake vent into said vent space in the region of the end thereof opposite said closed end, said inner enclosure being provided with an intake vent from said vent space in the region of said lamp mounting and with an outlet vent in the region of the end thereof remote from the closed end of the outer enclosure, and means for effecting circulation outwardly from said outlet vent.

4. In a device of the character described, the

combination with an elongated vertically disposed enclosure closed at its upper end and inlamp and accessible by means of said movable cluding a part movable to open said end and a portion of the side thereof, of a similarly disposed elongated inner enclosure therein in centrai relation therewith and separate from said movable part and said enclosures providing vent space therebetween surrounding said inner enclosure, a lamp mounting on the upper end of .said inner enclosure and within said outer enclosure and accessible by means of said movable part and adapted for removably carrying a lamp extending downwardly in said inner enclosure in central relation therewith, optical means removably mounted within said outer enclosure in cooperative relation with the filament of said part, said outer enclosure being provided with an4 intake vent into said vent space in the region of the lower end thereof and extended horizontally thereabout, said inner enclosure being provided with an intake vent from said vent space in the region of the upper end thereof and extended horizontally thereabout and provided with an outlet vent in the region of the lower end thereof and extended horizontally thereof, and means for effecting circulation outwardly from said outlet vent.

BRUNO STECHBART. 

